Shimmer Brush Whats The Diffrents Between A 17 Powder Brush ((and)) A 17 Shimmer Brush?

Whats the diffrents between a 17 Powder Brush ((and)) a 17 Shimmer Brush? - shimmer brush

I'll buy and share a makeup brush powder over entire face
is best
17 Shimmer Brush
http://www.boots.com/en/17-Shimmer-Brush_21783/

or
17 Powder Brush
http://www.boots.com/en/17-Powder-Brush_925502/

What is the best !!???

WB Thanks x